Which mathematical concept has revolutionized product recommendation systems used by major online retailers like Amazon?

Product innovation in retail often relies on mathematical models and algorithms to predict success and optimize features. From inventory management to customer prediction models, mathematics plays a crucial role in modern retail strategy. This trivia question explores how mathematical concepts are applied in contemporary product development processes.

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Collaborative filtering matrices and eigenvalue decomposition
Euclidean geometry and compass constructions
Differential calculus and Lagrange multipliers
Fractal dimension analysis and Mandelbrot sets